This is interesting, about Gabapentin. I took its cousin, Lyrica, one pill when I was recovering from Shingles a couple of years ago. The Shingles was in my hip, leg, foot, and I could barely walk when I got out of the hospital. The pain was more intense than anything I have had. So I hoped I could get off Demerol and get on the Lyrica.

Very bad results! Perhaps due to the problem you describe, of the drug traveling in the nerve, which is damaged, and building up! My reaction was to feel my breath constricted, you know, like we do sometimes. This was so bad that I just waited until the drug wore off and never took another one. One pill and out! Back to Demerol until
the Shingles was healed.